The result read-only property of the SVGFEColorMatrixElement interface describes the assigned name of an SVG filter primitive as a SVGAnimatedString.
It reflects the <feColorMatrix> element's result attribute. The <feColorMatrix> filter applies a matrix transformation on the RGB color and alpha values. The attribute value is a <custom-ident>. If supplied, then graphics that result from processing this filter primitive can be referenced by an in attribute on a subsequent filter primitive within the same <filter> element.
If no result attribute is defined, the filter's result.baseVal and result.animVal are empty strings, and the output of the <feColorMatrix> filter will only be available for re-use as the implicit input into the next filter primitive if that filter primitive provides no value for its in attribute.
const feColorMatrixElement = document.querySelector("feColorMatrix");
const filterName = feColorMatrixElement.result;
console.log(filterName.baseVal); // the filter's assigned nameSVGFEColorMatrixElement.in1<custom-ident> data type<blend-mode> data typemix-blend-mode property<filter> element, SVG filter attribute in SVG